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Thread: bicentric grind (on glass)

  1. #1
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    Arrow bicentric grind (on glass)

    what side is bicentric grind put on convex or concave for glass material?
    Last edited by redsoxfanfewany; 08-08-2005 at 10:27 PM. Reason: I forgot to put what material

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    ATO Member OPTIDONN's Avatar
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    I know that it can be ground on the back side but I am not sure if it can be purchased with the appropriate on the front like it can with plastic.

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    slab off

    Slab off is always ground on the toric surface...the non segment side as in the ocular surface of the lens

    Reverse slaboff is molded into the front surface and is only available in plastic...CR-39 and Younger seems to be the only manufacturer

    Ed

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    ATO Member OPTIDONN's Avatar
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    Quote Originally Posted by Ed_Optician
    Slab off is always ground on the toric surface...the non segment side as in the ocular surface of the lens

    Reverse slaboff is molded into the front surface and is only available in plastic...CR-39 and Younger seems to be the only manufacturer

    Ed
    Thanks Ed I was just thinking about who makes reverse slaboff! Are you a witch?!?!:p

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    Thank you

    I just wanted to thank you for your quick response

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    Objection! OptiBoard Gold Supporter shanbaum's Avatar
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    Quote Originally Posted by Ed_Optician

    Slab off is always ground on the toric surface...the non segment side as in the ocular surface of the lens
    In glass? I suppose it could be done on the ocular side, but it was traditionally done on the front of fused multifocals (which was not the toric surface)...

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    Rising Star OptiBoard Bronze Supporter casey's Avatar
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    glass slab-off

    Dug around a while to find a thread. Hope this works
    I have a Thin&Dark addict; wearing a D-28. Long-time customer and not afraid of cost. Walks in w/an Rx for slab-off. I found no-one to "pour a slab' (sorry for the old nomenclature). I called everyone I could think of AND everyone they could think of. I ended up ordering it in Trivex from Zeiss and am hoping for the best...Ideas?
    Am I just too old or is this technology gone? Or..?

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    Master OptiBoarder LENNY's Avatar
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    Quote Originally Posted by casey View Post
    Dug around a while to find a thread. Hope this works
    I have a Thin&Dark addict; wearing a D-28. Long-time customer and not afraid of cost. Walks in w/an Rx for slab-off. I found no-one to "pour a slab' (sorry for the old nomenclature). I called everyone I could think of AND everyone they could think of. I ended up ordering it in Trivex from Zeiss and am hoping for the best...Ideas?
    Am I just too old or is this technology gone? Or..?
    The real question is if someone still makes or has a blank with slab off in glass T&D...
    If not in US, maybe in India or former USSR.....

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    Master OptiBoarder LENNY's Avatar
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    I checked on Vision Web, it looks like they do make glass T&D FT28 in my glass lab...Vision Dynamics.
    I would also check with FEA since they are getting more and more in to glass and have FF capabilities.
    Last edited by LENNY; 09-25-2016 at 08:31 PM. Reason: add

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    Rising Star OptiBoard Bronze Supporter casey's Avatar
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    FEA turned me down in August. Don't know Vision Dynamics

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    OptiBoardaholic other_bill_fea's Avatar
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    Quote Originally Posted by casey View Post
    FEA turned me down in August. Don't know Vision Dynamics
    Yeah, we don't have blanks for it. Free-form surfaces we can do, but it still comes down to getting the blank to work with in some cases.
    FEA Industries
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    Eyes eastward... Uilleann's Avatar
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    Chadwick Optical?

    They seem to revel in the odd and funky. http://www.chadwickoptical.com/

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    Master OptiBoarder LENNY's Avatar
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    Quote Originally Posted by other_bill_fea View Post
    Yeah, we don't have blanks for it. Free-form surfaces we can do, but it still comes down to getting the blank to work with in some cases.
    Can you do a slab off on the regular FT28 glass blank?
    I heard DAC machines can do it!

  14. #14
    Rising Star OptiBoard Bronze Supporter casey's Avatar
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    Thank you. It was available in this form in the various 'Ultex' varieties. As late as the '70s. My mentor was huge in the Univis adaptations of these 'one-piece' bifocals before the WWII. He dropped out to go corporate when Univis got socked by a patent suits and lost initiative towards R&D. Went w/Joe Cole when they bought Ferrari and Risi.
    It's SO weird to be so removed from the generations that inherited their einheit from the Enlightenment. I work with people unfamiliar with algebra. I could make a B&L 70 SING in 'grade' school. Am I the last trouper that had even seen a master 'rock' a cylinder? I was too ashamed of my lab purchasing history to even call a group like the Fluegge bros...

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    One eye sees, the other feels OptiBoard Silver Supporter
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    Quote Originally Posted by casey View Post
    Fluegge bros...
    Casey,

    I talked to Scott at Fluegge Optical yesterday. He said they can do it, but for in-house clients only, no wholesale. Glenn Fluegge is an OB member and might make an exception.

    http://flueggeoptical.com

    WRT free-form slab-offs, I tried one (I average about 20 per year) and found the blend zone to wide (tall). Regardless, glass segmented multifocals, to the best of my knowledge, are no longer being produced in the U.S. Maybe Southeast Asia, but that seems unlikely considering the market for segmented and the time and expense required to produce it.

    I just got off the phone with Duffins Optical- customer service said they can do it. I didn't have time to talk to the lab manager to confirm.

    http://essilorlabs.com/lab/duffens-optical-lenexa

    Hope this helps,

    Robert Martellaro
    Science is a way of trying not to fool yourself. - Richard P. Feynman

    Experience is the hardest teacher. She gives the test before the lesson.



  16. #16
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    This is one of the best things about this community, they always go the extra mile for fellow members.

  17. #17
    Manuf. Lens Surface Treatments
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    Redhot Jumper That is exactly how it was done .......................

    Quote Originally Posted by shanbaum View Post

    In glass? I suppose it could be done on the ocular side, but it was traditionally done on the front of fused multifocals (which was not the toric surface)...

    That is exactly how it was done when I had my lab in the old times.

  18. #18
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    I work with Vision Dynamics and we can now do the glass slab offs. We are a specialty Glass laboratory. www.visdynlab.com.

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